\begin{table}[htbp]\centering
\caption{Robust IV Estimates of Log Registration on Log Registrations per Capita on Log VMT per Capita \label{tab:VMTPerCapitaiv}}
\begin{tabular}{l*{4}{c}}
\hline \hline \multicolumn{5}{l}{\textit{Panel A: IV Estimates and Robust 95\% Confidence Intervals}} \\&            &            &            &            \\
\multicolumn{5}{c}{Dep. Var.: Log Number of Vehicle Registrations} \\ &         (1)&         (2)&         (3)&         (4)\\
$\beta$     &      -0.276&       -0.27&       -0.39&       -0.27\\
95\% Conf. Set&[-1.46, 0.43]&[-1.45, 0.41]&[-6.77, 0.71]&(-$\infty$, $\infty$)\\
\makecell[l]{Data Source \nextline Controls}&        None&  Documented&\makecell{Large \nextline Undocumented}&\makecell{Small \nextline Undocumented}\\
State Fixed Effects&           Y&           Y&           Y&           Y\\
Year Fixed Effects&           Y&           Y&           Y&           Y\\
\makecell[l]{State-Specific Linear \\ Time Trends}&           Y&           Y&           Y&           Y\\
Common Controls&           Y&           Y&           Y&           Y\\
Number of Obs.&       2,424&       2,424&       2,424&       2,424\\
\hline \hline \multicolumn{5}{l}{\textit{Panel B: Anderson-Robin Test Statistics and P-Values}} \\&            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1.6$}} \\ AR Stat&   11.523***&   12.055***&     6.609**&       2.446\\
p-value     &       0.001&       0.001&       0.010&       0.118\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=1$}} \\ AR Stat&    8.774***&    9.345***&     5.198**&       1.865\\
p-value     &       0.003&       0.002&       0.023&       0.172\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0.3$}} \\ AR Stat&       2.623&      2.751*&       1.638&       0.577\\
p-value     &       0.105&       0.097&       0.201&       0.448\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=0$}} \\ AR Stat&       0.597&       0.592&       0.480&       0.131\\
p-value     &       0.440&       0.442&       0.488&       0.718\\
            &            &            &            &            \\
\multicolumn{5}{c}{\underline{$ H_{0}:\beta=-2.5$}} \\ AR Stat&     6.492**&     6.401**&       2.283&       1.580\\
p-value     &       0.011&       0.011&       0.131&       0.209\\
\hline \hline \end{tabular} \vspace{0.2cm} \begin{tablenotes} \begin{spacing}{0} \begin{footnotesize} \item \textbf{Notes:} The top panel of this table presents IV estimates and 95\% confidence sets robust to weak instruments of the linear relationship between log vehicle-miles travelled (VMT) per capita and log vehicle registrations per capita.  The bottom panel presents Anderson-Rubin chi-squared statistics along with p-values for different null hypotheses pertaining to the parameter estimated in the top panel.  The unit of observation is state-year. The four specifications pertaining to different levels of  (DSCs) and control specifications are documented in Table \cref{ssec:Spec}. Confidence sets are based on standard errors clustered by state. * p\textless 0.1, ** p\textless 0.05, *** p\textless 0.01 \end{footnotesize} \end{spacing} \end{tablenotes} \end{table}
